JPS59109924A - Memory card - Google Patents

Abstract

PURPOSE:To facilitate operation and to prevent the breaking of an electronic equipment, etc., by covering opening parts where the contact pattern of a memory card is set with an insulating solid-state lubricant film except at part of a shutter plate which is provided in a free opening and closing state. CONSTITUTION:The memory card 4 is attached to the electronic equipment 1 with a program function freely detachably. The card 4 consists of an upper plate 17, shutter plate 16, guide plate 20, insulating spacer 21, printed circuit board 11, and lower case 23; the contact pattern 5 of the board 11 is set at opening parts 6, 16a, and 21a and the pressure contact 8 of the electronic equipment 1 contacts it to connect the card 4 to the electric equipment. The shutter plate 16 is provided on the pattern 5 in the free opening and closing state to protect the pattern against corrosion, and faces the opening part 6. The shutter plate 16 is covered with the insulating solid-state lubricant film 24 except at its projecting piece 16b. Consequently, no short-circuit accident occurs even if the contact 8 is touched, and static electricity is flowed to an earth 11a through the projection 18 and a spring 22, so electrostatic destruction is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a memory card, and more particularly to a memory card as an external storage device for externally transmitting programs or data to and from an electronic device having a program function.

BACKGROUND TECHNOLOGY Conventionally, in many electronic devices that have a program function, a memory card, which serves as an external storage device and stores predetermined programs or data in advance, is removably installed in the device body as needed. It is configured so that the functions of the main unit can be expanded.

Therefore, instead of having to operate the keyboard provided on the device itself to program or input data, which is a tedious operation, the operator can use the memory card F that stores the necessary programs or data. All you have to do is put it on, making it extremely convenient.

The structures of a conventional memory card of this type and an electronic device to which it is installed are shown in Figures 1 to 3.

In FIGS. 1 to 3, the reference numeral 1 indicates a calculator. This calculator 1 has an upper case 1a and a lower case 1b, and the necessary arithmetic circuits, power supply, etc. are housed inside.

A keyboard 2 consisting of a large group of input keys is provided on a part of the front side of the calculator 1, and a display 3 is provided near the keyboard 2.

On the other hand, the one indicated by the reference numeral 4 is a memory card, which is formed in the shape of a flat case, and a part of the card is formed with an elongated opening 6 that crosses in the width direction.
The contact pattern 5 is exposed when facing.

On the other hand, on the back side of the lower case 1b of the calculator 1, a flat space 7 is formed in which the memory card 4 is accommodated, as shown in FIG. A pressure contact 8 is provided at a position corresponding to 5 in a slightly protruding state. This space 8 is closed by a lid 9 that can be opened and closed. A hook 9a is provided on the free end side of the lid 9, and this hook 9a is removably locked to a locking piece 10 provided on the lower case 1b side.

As shown in FIG. 3, a printed circuit board 11 is provided inside the memory card 4, and the contact pattern 5 is formed on this circuit board and faces the opening 6.

The printed circuit board 11 also includes various memory elements 12 (3). is installed.

An opening 13 is formed in the lower case 1b at a position corresponding to the contact pattern 5 of the memory card, and a press-contact type connector 14 is provided facing the opening 13.
The distal end portion (-the pressure contact point 8 is provided).

In FIG. 3, the reference numeral 15 indicates a printed circuit board on the main body side, and the reference 9b indicates a rotation axis of the lid 9.

When the original memory card 4 having such a structure is housed in the flat space 7, the contact pattern 5 and the pressure contact 8 are brought into contact with each other, and the lid 9 is closed, the pressure contact 8 is elastically deformed to ensure electrical connection. Continuity can be measured.

However, when the above structure is adopted, since the contact pattern 5 is exposed through the opening 6 of the memory card 4, it may corrode due to contact with the outside air and cause contact failure.
There is a drawback that when an operator directly contacts the contact pattern 5, static electricity is directly applied and the memory element 12 is destroyed.

(4) In order to eliminate these drawbacks, a structure was adopted in which a shutter plate that could be opened and closed was provided inside the memory card.

A conventional structure having a shutter plate is shown in the 4th to 4th potato diagrams.

In FIGS. 4 to 8, the same parts as in FIGS. 1 to 3 are given the same reference numerals, and their explanations will be omitted.

In FIGS. 4 to 8, the reference numeral 16 is a shutter plate, which is formed in a generally T-shape as a whole, and a part thereof has a shape that is almost the same as the opening 6 formed in the upper plate 17. A rectangular opening 16a is formed, a protruding piece 16b protrudes from the center of the side edge opposite to the opening 16a, and a protrusion 18 protrudes from the upper surface of the protruding piece 16b. This protrusion 18 projects outward through a long hole 19 formed in the vicinity of the opening 6 of the memory card top plate 17 and perpendicular thereto.

In addition, the guide plate 2 is placed in the same plane as the shutter plate 16.
0 is placed. The protruding piece 1 is attached to the side edge of the guide plate 20.
6b is slidable (=A notch 20b into which the shutter plate 16 is fitted is formed, and guides the shutter plate 16 linearly.

On the other hand, a spacer 21 made of an insulating material is arranged between the printed circuit board 11 and the shutter plate 16 to insulate the two, and an opening 21a is formed at a position corresponding to the contact pattern 5.

On the other hand, the printed circuit board 11 is mounted on the guide plate 20 and the spacer 21.
Through holes 20b and 21b are formed at positions corresponding to the earth pattern 11a formed on the top (2), and an earth spring 22 is fitted into these through holes 20b and 21b. The end is in contact with the upper plate 17 and the ground pattern -11a.As a result, the shutter plate 16 is always grounded via the earth spring 22, so even if static electricity is directly applied when the shutter plate 16 is closed, It can spread static electricity and prevent electrostatic damage.

In FIG. 8, reference numeral 23 indicates the lower case of the 11 memo 9-card.

If such a structure is adopted, the contact pattern can be covered by closing the shutter plate, the contact pattern will not be exposed directly to the outside, corrosion of the contacts and circuits can be prevented, and the shutter plate can be made to have good conductivity. By forming the shutter plate from a material such as metal, and grounding the shutter plate and the electronic circuit of the memory card, static electricity can be dissipated, and problems such as damage to the memory element caused by the shutter plate can be eliminated.

However, if the shutter plate is made of a metal material to prevent electrostatic damage, if there is little space between the shutter plate and the contact pattern when the shutter plate is closed, when the shutter plate is pressed, multiple contact patterns and the shutter plate There is a disadvantage that the contact patterns may come into contact with each other, causing a short circuit between the contact patterns and, as a result, destruction of the memory element.

Furthermore, if a memory card having such a structure is inserted into the main body of the device with the shutter plate closed, this will also cause a short circuit between the pressure contacts, resulting in the inconvenience of destroying the electronic circuit.

Furthermore, if the shutter plate is made of a metal material (7), there is a drawback that the shutter plate may become deformed and cannot be opened and closed smoothly.

Purpose The present invention has been made in order to eliminate the drawbacks of the conventional art as described below, and its purpose is to provide a memory card that is easy to operate and configured so that electronic circuits etc. will not be destroyed. It is said that

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

FIG. 9 explains one embodiment of the present invention, and the same parts as in FIGS. 4 to 8 are designated by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the shutter plate 16 is formed by punching out a metal plate in the same shape as the conventional one, but except for the protrusion 16b, it is made of a material with excellent insulation and lubricity, such as fluororesin. A solid lubricant coating 24 is formed. This solid lubricating coating 24 is formed on both the front and back surfaces except for the protruding piece 16b.

(8) If a shutter plate with such a structure is used, the solid lubricant film with excellent insulating properties will prevent short-circuit accidents when the shutter plate 16 is directly in contact with pressure contacts 8, etc., and static electricity will not be applied. Even in such a case, an earth spring is provided as in the conventional case, so that electrostatic damage to the memory element will not occur.

As is clear from the above description, the present invention employs a structure in which the shutter plate, which freely opens and closes the opening where the contact pattern of the memory card is exposed, is covered with a solid lubricant film with excellent insulation properties. Therefore, even if the shutter plate and the pressure contact on the electronic equipment side come into contact, a short circuit will not occur.
Furthermore, even if static electricity is applied, the static electricity can be released through the part of the shutter plate that is not covered with a solid lubricant film, and no electrostatic damage to the memory element or the like occurs.

[Brief explanation of the drawing]

Figures 1 to 3 explain the conventional structure; the first factor is an overall perspective view of an electronic device equipped with a memory card, Figure 2 is a perspective view of the electronic device seen from the back side, and Figure 3 is a sectional view taken along the line A-A in Fig. 2, Nos. 4 to 8 are for explaining other conventional structural examples, Fig. 4 is a perspective view of the memory card with the shutter closed, and Fig. 5 is a perspective view of the memory card with the shutter open, FIG. 6 is a partially enlarged longitudinal side view, section 7 is a plane view of the main part, FIG. 8 is an exploded perspective view, and section 9 is a perspective view of the memory card with the shutter open.
The figure is a perspective view of a shutter plate illustrating an embodiment of the present invention. 1...Electronic device 4...Memory card 5
...Contact pattern 603. Opening 8...pressure contact 9...lid 11...printed circuit board
14...Impact type connector 16...Shutter plate 16b...Protruding piece 17...Top plate 1
8...Protrusion 19...Long hole 24...Solid lubricant coating Fig. 3 Fig. 4 Fig. 6 Fig. 7 Fig. 9

Claims (1)

[Claims] In a memory card that is removably attached to an electronic device that has a programming function and that sends and receives data, a contact that faces the opening formed in a part of the memory card and makes an electrical connection with the electronic device itself. A memory car F is characterized in that the shutter plate provided on the upper side of the pattern so as to be openable and closable except for a part thereof is covered with a solid lubricant film having excellent insulation properties.